A drag racer starts her car from rest and accelerates at 11.9 m/s2 for the entire distance of 400 m. What is the speed of the race car at the end of the run?

Speed of the race car at the end of the run is 97.57 m/s

Explanation:

We have equation of motion v² = u² + 2as

Initial velocity, u = 0 m/s

Acceleration, a = 11.9 m/s²

Final velocity, v = ?

Displacement, s = 400 m

Substituting

v² = u² + 2as

v² = 0² + 2 x 11.9 x 400

v = 97.57 m / s

Speed of the race car at the end of the run is 97.57 m/s